Sustained glycolytic oscillations--no need for cyanide

Area of Science:

• Biochemistry
• Cellular Metabolism
• Microbiology

Background:

• The glycolytic pathway is fundamental to cellular energy production.
• Synchronized metabolic oscillations can occur in microbial systems.
• Understanding yeast metabolism is crucial for biotechnology and brewing.

Purpose of the Study:

• To investigate macroscopic oscillations in the glycolytic pathway of Saccharomyces cerevisiae.
• To identify the synchronizing agent responsible for these oscillations.
• To explore the role of volatile compounds in yeast cell synchronization.

Main Methods:

• Utilized fluorescence spectroscopy to detect oscillations in whole yeast cell suspensions.
• Employed inert gas bubbling (e.g., argon) to induce oscillations.
• Connected the sample cell to a membrane inlet mass spectrometer (MIMS) for online analysis of extracellular compounds.

Main Results:

• Detected long trains of macroscopic glycolytic oscillations in Saccharomyces cerevisiae without cyanide.
• Confirmed that oscillations can be induced by bubbling inert gas, suggesting a volatile synchronizing agent.
• Identified CO2 oscillations using MIMS, indicating its role in synchronization.
• Demonstrated that acetaldehyde removal rate is not critical for synchronization.

Conclusions:

• Volatile compounds, such as CO2, secreted by yeast cells act as synchronizing agents for glycolytic oscillations.
• Inert gas exposure can trigger these synchronized metabolic events.
• The findings provide new insights into the regulation of yeast metabolism and intercellular communication.